/*
 * Copyright 2011 Christoph Ludwig (christoph[at]chludwig.de). All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.chludwig.ehumanities.provenance.background;

import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

/**
 * A thread factory that generates threats with the daemon flag set.
 * 
 * This code is based on a 
 * <a href="http://stackoverflow.com/questions/4907502/running-a-background-java-program-in-tomcat/4908012#4908012">reply by <it>nos</it></a>
 * to StackOverflow question 4907502.
 */
public class DaemonThreadFactory implements ThreadFactory {

  private ThreadFactory underlyingFactory;
  
  /**
   * Constructs a new factory based on Executors.defaultThreadFactory.
   */
  public DaemonThreadFactory() {
    underlyingFactory = Executors.defaultThreadFactory();
  }
  
  /* (non-Javadoc)
   * @see java.util.concurrent.ThreadFactory#newThread(java.lang.Runnable)
   */
  @Override
  public Thread newThread(Runnable runnable) {
    Thread result = underlyingFactory.newThread(runnable);
    result.setDaemon(true);
    return result;
  }

}
